Separation membrane for water treatment and production method for same

a technology of separation membrane and water treatment, applied in the direction of membranes, filtration separation, separation processes, etc., can solve the problems of increasing economic burden and wastewater burden, and achieve the effects of reducing chemical costs and wastewater treatment loads, high permeability, and high solute removal performan

Active Publication Date: 2013-10-31
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]The present invention makes it possible to obtain separation membranes that combine high permeability and high solute removal performance without the use of new additives or a post-membrane production modification treatment step. By eliminating the need for a modification treatment step, the present invention also makes it possible to reduce chemicals costs and wastewater treatment loads and obtain separation membranes using a simple and safe method.

Problems solved by technology

Conventional methods have problems in that they increase the economic burden and wastewater burden load by increasing the amount of chemicals needed for membrane production.

Method used

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  • Separation membrane for water treatment and production method for same
  • Separation membrane for water treatment and production method for same
  • Separation membrane for water treatment and production method for same

Examples

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working examples

[0173]The present invention is described in more detail below using working examples, though the present invention is not, in any way, limited to those examples.

[0174]

[0175](1) Water Producing Capacity of Separation Membrane with Separation Functional Layer

[0176]The water producing capacity of a separation membrane featuring a substrate, porous layer and separation functional layer was measured as described below.

[0177]A separation membrane was fed seawater with a TDS concentration of 3.5 wt %, adjusted to a temperature of 25° C. and a pH of 6.5, as source fluid (i.e., feedwater) at an operating pressure of 5.5 MPa. The flow rate of permeate water obtained through the separation of the feedwater into permeate water and concentrate water was measured as the water producing capacity of the separation membrane (m3 / m2 / day) as expressed in terms of the daily amount of permeate water produced (m3 / day) per unit area of the membrane surface (m2).

[0178](2) Desalination Rate of Separation Mem...

working example 1

a. Preparation of Fiber-Reinforced Porous Film

[0189]As the resin constituting a porous layer, PSf (manufactured by Solvay Advanced Polymers K.K., Udel (registered trademark) P3500) was used. As the solvent of the polymer solution, DMIB was used. These were thoroughly stirred at 95° C., and a polymer solution comprising 15.0 wt % of PSf and 85.0 wt % of DMIB (stock solution for membrane production) was prepared.

[0190]Next, after being cooled to 25° C., the above polymer solution was cast over a nonwoven fabric made of polyester long fibers (yarn diameter: 1 decitex, thickness: approx. 90 μm, air permeability: 1 cc / cm2 / sec, fiber orientation angle in the surface layer next to porous layer: 40°, and fiber orientation angle in the surface layer opposite to porous layer: 20°) at room temperature (25° C.) to a thickness of 180 μm. Immediately after casting, it was immersed in pure water and left to stand in pure water for 20 seconds, followed by washing with 75° C. hot water for 2 minutes...

working example 2

[0195]A fiber-reinforced porous film was prepared in the same manner as working example 1, except that the polymer solution casting temperature during the formation of a porous layer was changed to 40° C.

[0196]A separation membrane was then prepared by forming a separation functional layer over this fiber-reinforced porous film in the same manner as working example 1.

[0197]The performances of such a film and membrane are shown in Table 1.

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Abstract

A separation membrane for water treatment, comprising a porous layer that is obtained by a phase separation method using a solution containing a resin and at least one of either an N,N-disubstituted isobutylamide or an N-monosubstituted isobutylamide.

Description

TECHNICAL FIELD[0001]The present invention relates to separation membranes useful for the selective separation of liquid mixtures, in particular separation membranes that not only combine high solute removal performance and high permeability but also can be advantageously used for solute removal, as well as manufacturing methods therefor.BACKGROUND ART[0002]In recent years, separation membranes have been in use in diverse fields, encompassing, among other things, water treatment, including drinking water production, water purification treatment and wastewater treatment, and the food industry. In the water treatment field, including drinking water production, water purification treatment and wastewater treatment, separation membranes are used to remove impurities from water as an alternative to conventional sand filters and coagulation precipitation systems. In the food industry, separation membranes are used for the separation and removal of yeast utilized in fermentation and concen...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B01D71/56C02F1/44B01D69/12B01D67/00B01D69/08B01D69/06
CPCB01D71/56B01D69/08B01D69/06B01D69/12B01D67/0009C02F1/44B01D2323/30B01D69/125B01D71/34B01D71/68B01D61/00B01D67/0013B01D67/0018B01D67/0011B01D63/10
Inventor TAKAGI, KENTAROKOIWA, MASAKAZUKIMURA, MASAHIROSUZUKI, YUTARO
Owner TORAY IND INC
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